/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
Insert a new edge connecting existing edges or vertices on a single face
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=ShapeEdits, Meta=(DisplayName="Insert Edge", DisplayPriority=14)) void InsertEdge()